阅读说明：本技术 一种方便翻页的数学教育用可移动书架 (Portable bookshelf is used in mathematics education that conveniently turns over page or leaf ) 是由 马宝环 张静茹 于 2020-05-11 设计创作，主要内容包括：本发明公开了一种方便翻页的数学教育用可移动书架,包括固定条和压条,所述固定条的一端固定连接于主定位头的外壁上,且主定位头的顶部设置有次定位头,所述固定条的另一端转动连接有连接条的一端,且连接条的两端外壁均固定有橡胶垫片,所述固定条和连接条的连接端部贯穿安装有橡胶头,且橡胶头的端部外壁上固定有拉块,所述滑槽的内部活动安装有滑块,且滑块的底部固定连接有限位杆,所述书架板的外侧底部设置有支撑条,且书架板通过螺杆和横杆与支撑条相互连接。该方便翻页的数学教育用可移动书架,方便书架在不同大小的黑板上沿上快速有效定位,同时便于对书本进行定位和定位后的翻页,方便书本位置的移动改变,进行查看使用。(The invention discloses a movable bookshelf convenient for page turning for math education, which comprises a fixed strip and a pressing strip, wherein one end of the fixed strip is fixedly connected to the outer wall of a main positioning head, the top of the main positioning head is provided with a secondary positioning head, the other end of the fixed strip is rotatably connected with one end of a connecting strip, the outer walls of the two ends of the connecting strip are respectively fixedly provided with a rubber gasket, the connecting end part of the fixed strip and the connecting strip is provided with a rubber head in a penetrating way, the outer wall of the end part of the rubber head is fixedly provided with a pull block, the inside of a sliding chute is movably provided with a sliding block, the bottom of the sliding block is fixedly connected with a limiting rod, the bottom of the outer side of a bookshelf plate is provided with a supporting strip. This portable bookshelf is used in mathematics education that conveniently turns over page or leaf makes things convenient for the bookshelf to follow the quick effective location on the blackboard of equidimension not, is convenient for simultaneously to fix a position books and the page or leaf that turns over after fixing a position, makes things convenient for the removal change of books position, looks over the use.)

1. The utility model provides a convenient portable bookshelf for mathematics education that turns over page or leaf, includes fixed strip (1) and layering (23), its characterized in that: one end of the fixed strip (1) is fixedly connected to the outer wall of the main positioning head (2), the top of the main positioning head (2) is provided with a secondary positioning head (3), a telescopic rod (4) is fixedly connected between the outer walls of the main positioning head (2) and the secondary positioning head (3), a first elastic part (5) is fixedly arranged inside the telescopic rod (4), the other end of the fixed strip (1) is rotatably connected with one end of a connecting strip (6), rubber gaskets (7) are fixed on the outer walls of the two ends of the connecting strip (6), a sleeve (8) is arranged on an upper rotating shaft on the outer wall of the end part of the connecting strip (6), a middle shaft (9) is slidably connected between the sleeves (8), a second elastic part (10) is fixed between the end parts of the sleeve (8) on the outer side of the middle shaft (9), and a rubber head (11) is arranged at the connecting end parts of the fixed strip (1) and the connecting strip (6, and the outer wall of the end part of the rubber head (11) is fixed with a pull block (12), the inner walls of the end parts of the rubber head (11) and the rubber gasket (7) are internally provided with a magnet piece (13), the bottoms of the fixed strip (1), the connecting strip (6), the rubber gasket (7) and the rubber head (11) are all reserved with a sliding groove (14), the inside of the sliding groove (14) is movably provided with a sliding block (15), the bottom of the sliding block (15) is fixedly connected with a limiting rod (16), the outer side of the limiting rod (16) is sleeved with a positioning sleeve (17), the two sides of the bottom of the positioning sleeve (17) are fixedly connected with the upper end of a vertical rod (18), meanwhile, the lower end of the vertical rod (18) is fixedly connected with a bookshelf plate (19), the bottom of the outer side of the bookshelf plate (19) is provided with a support bar (20), and the bookshelf plate (19) is connected with the support, and the screw rod (21) and the middle part of the supporting bar (20) are arranged in a penetrating way.

2. The movable bookshelf capable of conveniently turning pages for mathematics education as claimed in claim 1, wherein: the main positioning head (2) and the secondary positioning head (3) are both arranged to be L-shaped structures, the main positioning head (2) and the secondary positioning head (3) form a relative lifting structure, and the outer wall of the main positioning head (2) is fixedly connected with the end part of the fixing strip (1).

3. The movable bookshelf capable of conveniently turning pages for mathematics education as claimed in claim 1, wherein: the length of connecting strip (6) is less than the length of fixed strip (1), and all constitutes relative flip structure between connecting strip (6) and fixed strip (1) and connecting strip (6), and the pivot junction of connecting strip (6) and fixed strip (1) and connecting strip (6) is located the center axis position of self.

4. The movable bookshelf capable of conveniently turning pages for mathematics education as claimed in claim 1, wherein: slider (15) all constitute the block sliding connection that runs through spout (14) and fixed strip (1) and connecting strip (6) and rubber head (11), and rubber head (11) set up to coaxial relative extending structure with fixed strip (1).

5. The movable bookshelf capable of conveniently turning pages for mathematics education as claimed in claim 1, wherein: the positioning sleeve (17) consists of five parts, namely a sliding piece (1701), a positioning piece (1702), a push plate (1703), a connecting rod (1704) and a third elastic piece (1705), the positioning piece (1702) is movably connected to the end part of the sliding piece (1701), the push plate (1703) is arranged on the outer side of the sliding piece (1701), the connecting rod (1704) is hinged between the side of the push plate (1703) and the outer wall of the positioning piece (1702), and meanwhile the third elastic piece (1705) is fixedly connected between the sliding piece (1701) and the push plate (1703).

6. The movable bookshelf capable of conveniently turning pages for mathematics education as claimed in claim 5, wherein: the sliding piece (1701) and the positioning piece (1702) form a relative telescopic structure, the inner wall of the sliding piece (1701) is of an arc-shaped structure attached to the outer wall of the limiting rod (16), the middle part of the inner wall of the positioning piece (1702) is of a convex structure, one side, away from the inner wall of the sliding piece (1701), of the limiting rod (16) is of an inwards concave sawtooth structure distributed in a strip shape, and meanwhile the inwards concave sawtooth structure of the outer wall of the limiting rod (16) is connected with the convex structure of the middle part of the inner wall of the positioning piece (1702) in a clamping mode.

7. The movable bookshelf capable of conveniently turning pages for mathematics education as claimed in claim 5, wherein: the connecting rods (1704) are symmetrically arranged around the central axes of the sliding parts (1701) and the push plates (1703), the sliding parts (1701) correspond to the push plates (1703) one by one, two ends of each connecting rod (1704) are rotatably connected with the push plates (1703) and the positioning parts (1702) in a hinged mode, and the outer walls of the push plates (1703) are made of rubber materials.

8. The movable bookshelf capable of conveniently turning pages for mathematics education as claimed in claim 1, wherein: set up the revolution mechanic that the bearing is connected between screw rod (21) and bookshelf board (19), and the middle part of screw rod (21) and support bar (20) is the threaded connection who runs through to fixedly connected with cross rod (22)'s one end on bookshelf board (19), the other end of cross rod (22) sets up the relative extending structure of gliding with the inside of support bar (20) moreover.

9. The movable bookshelf capable of conveniently turning pages for mathematics education as claimed in claim 1, wherein: the pressing strip (23) is connected with a rotating shaft at the top of the bookshelf plate (19), a return spring (24) is fixed at the joint of the pressing strip (23) and the rotating shaft of the bookshelf plate (19), and a pressing rod (25) is vertically and fixedly connected to the outer wall of the pressing strip (23).

Technical Field

The invention relates to the technical field related to mathematical education, in particular to a movable bookshelf convenient for page turning for mathematical education.

Background

In the classroom education of mathematics, because of the teaching requirement, the educational knowledge is more fully shown to students, the blackboard can be repeatedly utilized, the problems and answers on the mathematics books, the record materials and the test paper are copied, copied and solved on the blackboard, when the teaching points on the books and the teaching record materials are copied and written with both hands, the teacher needs to repeatedly check the teaching materials placed on the desk, when the teaching time is wasted, the movable bookshelf is arranged on the blackboard to perform the auxiliary positioning on the teaching books and the record materials, so that the teaching books and the record materials placed on the blackboard are positioned more stably, and the teacher can conveniently check the contents of the knowledge points and perform copying, writing and drawing on the blackboard.

However, the prior movable bookshelf for mathematics education has the following problems in use:

1. the blackboard can not be quickly installed and positioned when in use, meanwhile, for blackboards with different lengths and widths, the positioning and the use are inconvenient to operate, the continuous, stable and effective implementation of teaching work is influenced due to the limitation of the lengths and the widths, and the storage, the installation, the positioning and the use have design defects;

2. after the location of teaching books and filing data, inconvenient book after the installation location turns over the page and turns over the location after the page for books appear turning over the page wantonly when the removal along with the bookshelf, cause teacher's the inconvenience of seeking, influence the teaching quality, increase teaching consuming time.

In order to solve the problems, innovative design is urgently needed on the basis of the original movable bookshelf for mathematics education.

Disclosure of Invention

The invention aims to provide a movable bookshelf convenient for page turning for mathematical education, and aims to solve the problems that the conventional movable bookshelf for mathematical education cannot be quickly installed and positioned on a blackboard during use, the positioning and the use of blackboards with different lengths and widths are inconvenient, the continuous, stable and effective implementation of teaching work is influenced due to the limitation of the lengths and the widths, the storage, the installation and the positioning and the use have design defects, and after the positioning of teaching books and filing data, the books installed and positioned are inconvenient to be turned over and positioned after page turning, so that the books are arbitrarily turned over when moving along with the bookshelf, the search of a teacher is inconvenient, the teaching quality is influenced, and the teaching time is increased.

In order to achieve the purpose, the invention provides the following technical scheme: a movable bookshelf convenient for page turning for math education comprises a fixing strip and a pressing strip, wherein one end of the fixing strip is fixedly connected to the outer wall of a main positioning head, a secondary positioning head is arranged at the top of the main positioning head, a telescopic rod is fixedly connected between the outer walls of the main positioning head and the secondary positioning head, a first elastic piece is fixedly arranged inside the telescopic rod, the other end of the fixing strip is rotatably connected with one end of a connecting strip, rubber gaskets are fixed on the outer walls of the two ends of the connecting strip, sleeves are installed on the outer walls of the end parts of the connecting strip, a middle shaft is slidably connected between the sleeves, a second elastic piece is fixed between the end parts of the sleeves outside the middle shaft, a rubber head is installed at the connecting end part of the fixing strip and the connecting strip in a penetrating manner, a pulling block is fixed on the outer wall of the end part of the rubber head, and a magnet piece is installed in the inner walls, and the bottom of fixed strip, connecting strip, rubber gasket and rubber head all reserves the spout, the inside movable mounting of spout has the slider, and the bottom fixedly connected with gag lever post of slider to the outside cover of gag lever post is equipped with the position sleeve, and the upper end of the bottom both sides fixedly connected with montant of position sleeve, the lower extreme fixedly connected with bookshelf plate of montant simultaneously, bookshelf plate's outside bottom is provided with the support bar, and bookshelf plate passes through screw rod and horizontal pole and support bar interconnect, and the screw rod runs through the setting with the middle part of support bar.

Preferably, main location head and inferior location head all set up to "L" style of calligraphy structure, and main location head and inferior location head constitute relative elevation structure to fixed connection between the outer wall of main location head and the tip of fixed strip.

Preferably, the length of the connecting strip is smaller than that of the fixing strip, the connecting strip, the fixing strip and the connecting strip form a relative overturning structure, and the connecting position of the connecting strip, the fixing strip and the rotating shaft of the connecting strip is located on the central axis of the connecting strip.

Preferably, the slider passes through the spout and all constitutes the block sliding connection that runs through with fixed strip and connecting strip and rubber head, and the rubber head sets up to coaxial relative extending structure with the fixed strip.

Preferably, the locating sleeve comprises a sliding part, a locating part, a push plate, a connecting rod and a third elastic part, the end part of the sliding part is movably connected with the locating part, the push plate is arranged on the outer side of the sliding part, the connecting rod is hinged between the side of the push plate and the outer wall of the locating part, and the third elastic part is fixedly connected between the sliding part and the push plate.

Preferably, the sliding part and the positioning part form a relative telescopic structure, the inner wall of the sliding part is arranged to be an arc-shaped structure attached to the outer wall of the limiting rod, the middle part of the inner wall of the positioning part is arranged to be a convex structure, one side, far away from the inner wall of the sliding part, of the limiting rod is arranged to be an inwards concave sawtooth structure distributed in a strip shape, and meanwhile the outwards concave sawtooth structure of the outer wall of the limiting rod is connected with the convex structure in the middle part of the inner wall of.

Preferably, the connecting rod is the symmetry setting about the central axis of slider and push pedal, and slider and push pedal one-to-one to be articulated rotation connection between the both ends of connecting rod and push pedal and the setting element, the outer wall of push pedal sets up to the rubber material moreover.

Preferably, a rotating structure connected with a bearing is arranged between the screw rod and the bookshelf plate, the screw rod is in threaded connection with the middle of the supporting bar in a penetrating mode, the bookshelf plate is fixedly connected with one end of a cross rod, and the other end of the cross rod and the inside of the supporting bar are arranged to be of a sliding relative telescopic structure.

Preferably, the pressing strip is connected with a rotating shaft at the top of the bookshelf plate, a return spring is fixed at the joint of the pressing strip and the rotating shaft of the bookshelf plate, and the outer wall of the pressing strip is vertically and fixedly connected with a pressing rod.

Compared with the prior art, the invention has the beneficial effects that: the movable bookshelf convenient for page turning for mathematical education facilitates quick and effective positioning of the bookshelf on the upper edges of blackboards with different sizes, positioning of books and page turning after positioning, and convenient movement and change of the positions of the books for viewing and use;

1. the main positioning head and the secondary positioning head can be quickly and effectively clamped on the upper edge of the blackboard only through relative lifting movement between the main positioning head and the secondary positioning head, meanwhile, under the action of overturning movement between the fixing strip and the connecting strip, the end part of the overturning movement between the main positioning head and the secondary positioning head is in butt joint positioning under the action of the magnet piece, so that the bookshelf can still reach different positions of the blackboard when the blackboard is different in size, the total length of the limiting rod and the vertical rod can be conveniently adjusted through the installation effect of the positioning sleeve and the structural characteristics of the positioning sleeve, and books can be quickly and effectively positioned at different positions on the blackboard through the action of the main positioning head and the secondary positioning head;

2. when the height of the bookshelf plate is changed, the support bars movably mounted on the bookshelf plate adjust the distance between the support bars and the bookshelf plate by using the screw rods, so that books under different belts can be obliquely placed under the action of the bookshelf plate and the support bars, the oblique angle of the books is adjusted, the press bars drive the press bars to be relatively turned over with the bookshelf plate under the action of the press bars mounted on the rotating shafts, the books are clamped and positioned, and meanwhile, the page turning work of the books on the side is performed when the books are placed.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic view of the installation structure of the telescopic rod of the present invention;

FIG. 3 is a schematic view of the structure of the fixing strip and the connecting strip of the present invention;

FIG. 4 is a schematic view of a mounting structure of a stop lever according to the present invention;

FIG. 5 is a schematic view of a positioning sleeve according to the present invention;

FIG. 6 is a schematic view of the support bar mounting structure of the present invention.

In the figure: 1. a fixing strip; 2. a main positioning head; 3. a secondary positioning head; 4. a telescopic rod; 5. a first elastic member; 6. a connecting strip; 7. a rubber gasket; 8. a sleeve; 9. a middle shaft; 10. a second elastic member; 11. a rubber head; 12. pulling the block; 13. a magnet piece; 14. a chute; 15. a slider; 16. a limiting rod; 17. a positioning sleeve; 1701. a slider; 1702. a positioning member; 1703. pushing the plate; 1704. a connecting rod; 1705. a third elastic member; 18. a vertical rod; 19. a bookshelf plate; 20. a supporting strip; 21. a screw; 22. a cross bar; 23. layering; 24. a return spring; 25. a pressure lever.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: a movable bookshelf convenient for page turning for mathematics education comprises a fixing strip 1, a main positioning head 2, a secondary positioning head 3, an expansion link 4, a first elastic piece 5, a connecting strip 6, a rubber gasket 7, a sleeve 8, a middle shaft 9, a second elastic piece 10, a rubber head 11, a pulling block 12, a magnet piece 13, a sliding chute 14, a sliding block 15, a limiting rod 16, a positioning sleeve 17, a sliding piece 1701, a positioning piece 1702, a pushing plate 1703, a connecting rod 1704, a third elastic piece 1705, a vertical rod 18, a bookshelf plate 19, a supporting strip 20, a screw rod 21, a cross rod 22, a pressing strip 23, a return spring 24 and a pressing rod 25, wherein one end of the fixing strip 1 is fixedly connected to the outer wall of the main positioning head 2, the secondary positioning head 3 is arranged at the top of the main positioning head 2, the expansion link 4 is fixedly connected between the outer walls of the main positioning head 2 and the secondary positioning head 3, the first elastic piece 5 is fixedly, the other end of the fixed strip 1 is rotatably connected with one end of a connecting strip 6, the outer walls of two ends of the connecting strip 6 are both fixed with rubber gaskets 7, the outer wall of the end part of the connecting strip 6 is provided with a sleeve 8 in a rotating shaft manner, a middle shaft 9 is connected between the sleeve 8 in a sliding manner, a second elastic piece 10 is fixed between the end parts of the sleeve 8 outside the middle shaft 9, a rubber head 11 is arranged at the connecting end part of the fixed strip 1 and the connecting strip 6 in a penetrating manner, a pull block 12 is fixed on the outer wall of the end part of the rubber head 11, a magnet piece 13 is embedded in the inner walls of the end parts of the rubber head 11 and the rubber gaskets 7, sliding grooves 14 are reserved at the bottoms of the fixed strip 1, the connecting strip 6, the rubber gaskets 7 and the rubber head 11, sliding blocks 15 are movably arranged in the sliding grooves 14, the bottoms of the sliding blocks 15 are fixedly connected with limiting rods 16, positioning sleeves 17 are sleeved outside the limiting, meanwhile, the lower end of the vertical rod 18 is fixedly connected with a bookshelf plate 19, the bottom of the outer side of the bookshelf plate 19 is provided with a support bar 20, the bookshelf plate 19 is connected with the support bar 20 through a screw rod 21 and a cross rod 22, and the screw rod 21 and the middle part of the support bar 20 are arranged in a penetrating manner.

The main positioning head 2 and the inferior positioning head 3 all set up to "L" style of calligraphy structure, and main positioning head 2 and inferior positioning head 3 constitute relative elevation structure, and fixed connection between the outer wall of main positioning head 2 and the tip of fixed strip 1, the length of connecting strip 6 is less than the length of fixed strip 1, and all constitute relative flip structure between connecting strip 6 and fixed strip 1 and the connecting strip 6, and the pivot junction of connecting strip 6 and fixed strip 1 and connecting strip 6 lies in the center axis position of self, the equipment of the main positioning head 2 of being convenient for and inferior positioning head 3 is along carrying out firm installation location on the blackboard, make its dismouting convenient operation, make things convenient for the change of total length of stack to adjust between fixed strip 1 and the connecting strip 6 simultaneously.

Slider 15 all constitutes the block sliding connection who runs through spout 14 and fixed strip 1 and connecting strip 6 and rubber head 11, and rubber head 11 sets up to coaxial relative extending structure with fixed strip 1, makes things convenient for slider 15 and bookshelf board 19's position to move and changes the regulation, makes it can move along with teacher's position change, improves its convenience of use and smoothness degree.

The positioning sleeve 17 consists of five parts, namely a sliding part 1701, a positioning part 1702, a push plate 1703, a connecting rod 1704 and a third elastic part 1705, the positioning part 1702 is movably connected to the end part of the sliding part 1701, the push plate 1703 is arranged on the outer side of the sliding part 1701, the connecting rod 1704 is hinged between the side edge of the push plate 1703 and the outer wall of the positioning part 1702, the third elastic part 1705 is fixedly connected between the sliding part 1701 and the push plate 1703, the sliding part 1701 and the positioning part 1702 form a relative telescopic structure, the inner wall of the sliding part 1701 is in an arc structure attached to the outer wall of the limiting rod 16, the middle part of the inner wall of the positioning part 1702 is in a convex structure, one side of the limiting rod 16 far away from the inner wall of the sliding part 1701 is in a concave sawtooth structure distributed in a strip shape, the concave sawtooth structure of the outer wall of the limiting rod 16 is in a clamping connection, and slider 1701 and push pedal 1703 one-to-one to be articulated rotation connection between the both ends of connecting rod 1704 and push pedal 1703 and the setting element 1702, and the outer wall of push pedal 1703 sets up to rubber material, be convenient for adjust the block locating position of position sleeve 17 in the gag lever post 16 outside, make the total length of stack between gag lever post 16 and the montant 18 change, change bookshelf plate 19 the place locating position height, make teaching books can follow the teacher and write the position difference and change on the blackboard, make things convenient for the teacher to watch.

Set up the revolution mechanic that is connected to the bearing between screw rod 21 and the bookshelf board 19, and the middle part of screw rod 21 and support bar 20 is the threaded connection who runs through, and fixedly connected with horizontal pole 22's one end on the bookshelf board 19, and the other end of horizontal pole 22 sets up to gliding relative extending structure with the inside of support bar 20, is convenient for according to the variation in size of the height of books, adjusts the mounted position of support bar 20 on bookshelf board 19, makes it place the location and look over more convenient.

The pressing strip 23 is connected with a rotating shaft at the top of the bookshelf plate 19, a return spring 24 is fixed at the joint of the pressing strip 23 and the rotating shaft of the bookshelf plate 19, and a pressing rod 25 is vertically and fixedly connected to the outer wall of the pressing strip 23, so that the book can be conveniently positioned and the page turning operation for checking the book can be conveniently carried out.

The working principle is as follows: when the movable bookshelf convenient for page turning for mathematics education is used, firstly, as shown in figure 1-2, when the movable bookshelf is required to be installed and positioned on the upper edge of a blackboard, the upper edge of the blackboard is clamped through the combined action of the main positioning head 2 and the secondary positioning head 3, then under the installation action of the telescopic rod 4 and the first elastic piece 5, the main positioning head 2 and the secondary positioning head 3 are mutually extruded to clamp and reinforce the upper edge of the blackboard, the total length of the superposition between the connecting strip 6 and the fixed strip 1 is changed according to the length difference of the upper edge of the blackboard required to be installed and positioned, as shown in figure 1 and figure 3, the connecting strip 6 is coaxially butted with the end part of the fixed strip 1 through the overturning between the connecting strip 6, the fixing strip 1 and the connecting strip 6, the end part of the connecting strip 6 is fixed under the action of the magnet piece 13 in the rubber gasket 7, and simultaneously, the end part of the fixed strip 1 passes through the action of the rubber head 11 and the magnet piece 13 which are connected in a, the fixing strips 1 can be coaxially butted, the total length of the connection strips 6 and the fixing strips 1 is changed, the bookshelf is convenient to adapt to bookshelves with different sizes, and the sliding blocks 15 and the bookshelf plates 19 are convenient to transversely locate under the clamping sliding connection effect between the sliding blocks 15 and the sliding grooves 14, so that the bookshelf is convenient to use;

according to fig. 1 and 4-5, when the vertical height position of the bookshelf plate 19 needs to be changed, as shown in fig. 5, the positioning sleeve 17 is manually grasped, so that the third elastic member 1705 is elastically compressed, the distance between the sliding member 1701 and the push plate 1703 is changed, the sliding member 1701 and the positioning member 1702 are made to slide and stretch, the snap-fit connection relationship between the inner wall of the positioning member 1702 and the limiting rod 16 is changed, the limiting rod 16 and the positioning sleeve 17 can slide relatively, the total overlapping length of the limiting rod 16 and the vertical rod 18 is adjusted, and the position of the bookshelf plate 19 is changed, in conclusion, when the horizontal and vertical positions of the bookshelf plate 19 are changed, a teacher can conveniently move and change the position of a textbook placed on the bookshelf plate 19, and the use work is convenient to be performed, according to fig. 4 and 6, when books with different sizes are placed on the bookshelf plate 19, by manually rotating the screw 21, the supporting bars 20 are in threaded connection with the screw rods 21 and are in sliding connection with the cross rods 22, the distance between the supporting bars 20 and the bookshelf plates 19 is changed, books can be placed between the supporting bars and the bookshelf plates in a stable inclined mode, meanwhile, the pressing bars 23 mounted on the rotating shafts at the tops of the bookshelf plates 19 act, the pressing bars 23 are used for clamping and turning pages of the books conveniently through the reset springs 24 and the pressing bars 25, the pages can be positioned after being unfolded, and the books can be checked conveniently.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.